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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2276d4bc840bcd0e5199b5e2d89999ef45a8ee7ca0dd9df0b20f436460d637f4' 
  AND token = 'jen8oaHx5HLLCZNtOasDDygW/eTaAPS//doCwD68FW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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