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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9bc878922303e1905be0f8cad778cfa9f0af1a788a20dc018c70506b944e8e3' 
  AND token = 'L92lYNSKyLbsCkAjl72KJ2L1jU/hpTS8MDWju3L5SlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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