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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c333b3a996e44e6eeee6d971e2df84deb2665b6bfba73d477a36ea4835ec3e30' 
  AND token = 'TnSZo1vAVM2dGfvHHIhPG910PGctGl9FCocmz2cV+Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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