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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3aefa07975766c265653e79d3b04520163ba6766f9fac916ec519f533b95b47f' 
  AND token = 'l2s2sTbR6fimREgfRRRm85uWTZcpPXY0sMlKLFgwDEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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