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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae7267836e7f66fecad69fd4f21fa0b8d0c02f05a427c2eb18bb7cdcd5fcee2f' 
  AND token = 'gEaR9PGnw+e5n0CC2hPgHoomjt9kMvumPZfB0TKMbgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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