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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa30a7b0ead1fbce366a668e2184a68197c4d039aa7e4fa712838d3c6afa9e17' 
  AND token = '3Eo42mCm+FI6P1pcvB2zZeRDFgiGdDohf0Xq6LZnve0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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