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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'edab7268ca1e95e79899eeec2d344ba0472f100170f5acf537209eef8b6fa07b' 
  AND token = 'W1irxQwZHKTPku8ct/ssZ8r5nPl0l50kurP+czgtd4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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