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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4f6e387bfdfe2787be7639c9acbde578dc4e6d762e1bad164ed6796a0c86ddd' 
  AND token = 'u4vbfpwPUKA1ZJj1r8J/98jWKPJLnT8w+Gn8T3DgtnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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