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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '232270227cb5764eb791a5e70bc6f275533fe3bb94a72197af6dccb978336dc4' 
  AND token = 'HMcr9hRSS6XXSCA2qkniLJGIp5Qq72dvB28QcEa2ZlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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