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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa00d4d3cae96cc518b2ef0236f80145ca3ad65dfb087da092febd6ddd3dd183' 
  AND token = 'nSV0H8UAAbxrM8Qtci+rMC6UgfcuuX39r7xCz2NL/Eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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