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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e9a4584c034d17958f542786873505a5cadd13e0b8fa068d96921de2a99cc46' 
  AND token = 'LUZ0IgriFosaLlSBB/pUy+/31bhsRaieNuTK+8dojyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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