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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2da89587f175dad292f2162c085b7e359a4eadc01075e19ef375410a0e760bcc' 
  AND token = 'yWvQ3Yfdx2ZpAbVjM5RfPNgmOVvy2eHzSqwK4NM9N18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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