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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c9064d4e583639203efde585ed2cf5ae16bdc58b3bb5b4ead592ea6be32f178' 
  AND token = 'uy40SwSGVssA7Rn6OxUGODK5CjF9xOwq3tCpsy9nsUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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