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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33216f31fd705b5cea2d0efb7bbdbd6872e82ff94275b2ec2b222f990c2e0559' 
  AND token = 'RcxYldhZe6ZKChLR3P6bm9p9EOmqpFP1v0sGfZ/rtGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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