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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7af1e0ba010ea7dae43842b8c3e65f2ce347188dcbe31cc1b1e25b154a64c8be' 
  AND token = 'AWTpy2N783ksceqBpYMbsyMywvBnObDZQuSFbQeHTPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}