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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1d63948863cb9fd531d4c8e67d9fd8196a6927afe9298b5729edbccd772379c' 
  AND token = 'Nonrgyl6owHkTNEgCLrA40P3b9Y22Y/jG++zfXW1PYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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