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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c710eeacbf7ca179113b0c3428735eecd6f3b55eb01072d9302e7db5b9659b8c' 
  AND token = 'P5esCYz8pv5ggeZAzot2VSMm8DZaDHF3uqI0f4HcahI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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