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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f376e013c39391cb29f9083da3d3cde2b1e2046342e8d4803edd0a1a7fb9e716' 
  AND token = 'mAtB/fmMMR5ogVCgUW88GjRZ3Sf86oC16XNAtNyNIl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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