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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27c52d2db1bd8c16a311a641339eaafa1b8e72da2a3ccfcbdb3b9d59eadb5b1e' 
  AND token = '2FKWgJp/DoipKnj/XoBkX4xsK2PPSNUVEtTP2zC2coY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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