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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af8edd6756cdbda74501c93bfba40eb262541a347d77942875a1462f0a70189e' 
  AND token = 'h7C2MNO3gOdFmqukdv51x8VQGnxk3P4/6T06UOECHiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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