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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cdb6e8bb88a99faa72888cae0012809e0d5a08c6a604d5e6fca224123610707c' 
  AND token = 'PyXmKd+Jruwqe1J2gMPm96PC30+WaWzyuyu8cJT1Oco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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