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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36b69b115dc6a2eef73624321d02218f5620d37986cfa523d05404607859461c' 
  AND token = '5zD2awDU8EdaRm0vbcu2QxwLiEhA2T3TmeOKy+5GtpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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