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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4be9f8ec43909dad6ab34aa2b7cb5ba67607ac2030e353b2447d6340c3271ce2' 
  AND token = 'SWb0N72U8tDPK9mOMFBmpRamNTv9AmI9pyYK1gDpBIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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