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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93df3842887e4d9daf26234f6bfbccdd1dbe934bb475dcc4fbc2e1e3e08d14c0' 
  AND token = 'V12B52zoKMCsBVFg2BmKZuRK88CSud07h8FTl10gYbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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