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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9dfc1d9e5d31bf59f4dce695508519b04c4e43301b90adcf7cea68d764561beb' 
  AND token = 'tHBvdyr4CpmfQ9C22Gc0428XNPLG5u1jgUc/xuVfiPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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