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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1cd2b903cddd8c42bcf89f069b047de16df88c427679f76958f0c3cfa11df993' 
  AND token = 'q34yswnSxRYB9BlU77HmLITww8cn2QdHG29OcLucsTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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