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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e586beb2f675473104f2c726ab3d2ae8f28634780a420b2c910fc2a6937c9b9e' 
  AND token = 'WSzzrcXTDkisoxP9ZUbu2xr4jO9ySmvv12BGvzumOZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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