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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15e5f81d0a98503b6bb220ca42a7f641f5f850b7bcc55c3c6585eac8ea87d965' 
  AND token = 'ORH+0av0bfLzjiZY3GrSgXKisl8XRCzEvFKv7+fjoSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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