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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62caf21d37350b54aa778085e6cd0fb75108093c85abf426547716b4003b6180' 
  AND token = 'SkmooSDRpDhtGeYf55iZJtokYTUuL1m16pNLwdmN574=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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