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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '766bbf6a592541361898aa21be24e691d27545c671d6367e752f94f49796b742' 
  AND token = 'Oqausz9F9iy1qQYWNBml3CeFiefBh7S93lcod9imBeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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