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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dce573bd6884bbd087bf85f0b02ddd660f6be5ed731a6181c12e489d2de5efed' 
  AND token = '/GNxq1o6Jdh74w/uruEKNRS1TA+bCGYMK5aT3CAQUec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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