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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7449bee9d5f767073356485ba5b4ed2b99264be795db3dec101b8cfdf064f275' 
  AND token = 'boD516aHi6YRU8VoQN0In9oII91ZNFXSN5mRpHkJ/jU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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