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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '577a92b7004537d414335a47f4a04c3aac0d9f04ec8ccd1bd65eca84273b7c4e' 
  AND token = '7lQWuIHEFhVlgg4LxSCTrquennJxxFixx8ELPNygqyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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