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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f26ed56776a1dba1a7b46e1236cd00a9e47df3ae2d3a66d55a79ff09eb662480' 
  AND token = 'laekL8qcsaViVozxBEUFKruk3DtxamR53NY2xyWZr+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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