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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a71a3878b338f0bdb71d18a1e4e1746e2314bb286d8998925391df254314b6d' 
  AND token = 'T7ywQ+kwjKbLMWdTb/KDoKncVax4MDyIg/v+3ACnuIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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