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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0be15a4797f5ca927ba787e117fc1892693e12c7401d03f9830f893769ecbbf' 
  AND token = '05fpsAVEOFbUQZ2Z1InJL7MTE6+Zayuuw0D4NXAI9O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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