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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73ad5493ab563880542e88fd7b89a17cba596dfe4274562012888d7afa9fbbb2' 
  AND token = 'gXr72aOVrtcsbvji1P5N14lOahmpJ4u6tV5CCItiXaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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