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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6fdc2e82ea880ba88671f6441f8c5d367ce0c5a877abc36876f5483b8aa9ae30' 
  AND token = 'DQy+i1Xn0Ev7cZcaQn73bhKsUqWoVf+k0dWvIm3tk7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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