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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '835cd12801a83da7a7f3a6ae98efa49245e5ca6654f6d3cf409afea4439660ce' 
  AND token = 'S2f/nPw5+RfqJ7Wsrgp1erpUNDMHu/BZHK0gqAZQk1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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