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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '905461491a19b5c369fc9ea248ec2bed35c6f65524ab10526c80b7d42e2be87b' 
  AND token = '+7+I5eDTXSN4yDaX0lQ2bLCixhEHjS53/SMRysWPAxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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