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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '819d8ec068bf179ce96449b1390650cd9b50b90ab00d76d79f111cd161091292' 
  AND token = 'iIxQr8Fjn1nmOASPICzYkETiiqYL4bxKPWVJGj3EKAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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