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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d1c707aea06b42b6953e833cf44f697369b57fc1f5bb7bd2cd702d5c542a7da' 
  AND token = 'sf44dSs6YewZ5D+eQAVEL9I6wjex0yFGusP9vREJHUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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