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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bcc20051005e77fb8682367d3f720e96e2e0ed39699d8bc579d6047ec3c402ce' 
  AND token = 'BSovw/5xn8m/ZFGa9qe97to/fHsrr2+lTZBaiIi3Tt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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