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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e9c27422ee3134b02ad4602c81e0c06931d84e006cda5b68c01bdb8ff6a72064' 
  AND token = 'ePg/IVNn36WdAga/IJA1n62qrvV/5EDYQ6uBbURfrUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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