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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7748f7181a52cc770ea050fe20e211ca5dbf0c3167b79d4faf26e795835bd698' 
  AND token = 'F4qCOfI0aUHVo3MUsAWUb6tA+5K51L7EyCOJz2e68yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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