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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e5a8f2373692662c0b75782c48c1d5ebc1736d82ff0fe67fa01390546b90393d' 
  AND token = 'r8G5Pfey4W79fHtqQ5g5oyP8HJVutEAc8SlRnsjP4Wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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