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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0676cedae2b1b4c16a88dba9bba4bfc10d2ee3b773e2fbc189132538c1e8514e' 
  AND token = 'GtIDeAzhJiO4fX4G6S/fsv8KExxsSKmnPgOx8dE3Tcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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